Algodoo

Same situation as your first scene. That is, the restitution in the canon is way too high. In fact on my second shot, the entire canon disappeared!

I think a reasonable value for the restitution is a few hundred (not 10 million!).

i was trying to make the most POWERFUL CANNON im the whole pun world !

I'm not so sure that you achieved that because there are a LOT of powerful guns and cannons here on Algobox. I guess the real test would be if you are claiming that the projectiles from your cannon have the most kinetic energy of any other cannon, or if the projectiles have the highest velocity of any other cannon, or if the projectiles have the most destructive potential. So, you see, it all depends on how you define "most powerful". Then, once you decide on a definition of the term "most powerful", you would need to PROVE your claim by going through all the gun and cannon scenes on Algobox to determine how powerful THEY are (which would be a huge task for anyone!)